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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_device.h - V4L2 Device
*/
#ifndef __LIBCAMERA_V4L2_DEVICE_H__
#define __LIBCAMERA_V4L2_DEVICE_H__
#include <atomic>
#include <string>
#include <vector>
#include <linux/videodev2.h>
#include <libcamera/geometry.h>
#include <libcamera/signal.h>
#include "formats.h"
#include "log.h"
namespace libcamera {
class Buffer;
class BufferPool;
class EventNotifier;
class MediaDevice;
class MediaEntity;
struct V4L2Capability final : v4l2_capability {
const char *driver() const
{
return reinterpret_cast<const char *>(v4l2_capability::driver);
}
const char *card() const
{
return reinterpret_cast<const char *>(v4l2_capability::card);
}
const char *bus_info() const
{
return reinterpret_cast<const char *>(v4l2_capability::bus_info);
}
unsigned int device_caps() const
{
return capabilities & V4L2_CAP_DEVICE_CAPS
? v4l2_capability::device_caps
: v4l2_capability::capabilities;
}
bool isMultiplanar() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool isCapture() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_META_CAPTURE);
}
bool isOutput() const
{
return device_caps() & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE |
V4L2_CAP_META_OUTPUT);
}
bool isVideo() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool isMeta() const
{
return device_caps() & (V4L2_CAP_META_CAPTURE |
V4L2_CAP_META_OUTPUT);
}
bool isVideoCapture() const
{
return isVideo() && isCapture();
}
bool isVideoOutput() const
{
return isVideo() && isOutput();
}
bool isMetaCapture() const
{
return isMeta() && isCapture();
}
bool isMetaOutput() const
{
return isMeta() && isOutput();
}
bool hasStreaming() const
{
return device_caps() & V4L2_CAP_STREAMING;
}
};
class V4L2DeviceFormat
{
public:
uint32_t fourcc;
Size size;
struct {
uint32_t size;
uint32_t bpl;
} planes[3];
unsigned int planesCount;
const std::string toString() const;
};
class V4L2Device : protected Loggable
{
public:
explicit V4L2Device(const std::string &deviceNode);
explicit V4L2Device(const MediaEntity *entity);
V4L2Device(const V4L2Device &) = delete;
~V4L2Device();
V4L2Device &operator=(const V4L2Device &) = delete;
int open();
bool isOpen() const;
void close();
const char *driverName() const { return caps_.driver(); }
const char *deviceName() const { return caps_.card(); }
const char *busName() const { return caps_.bus_info(); }
const std::string &deviceNode() const { return deviceNode_; }
int getFormat(V4L2DeviceFormat *format);
int setFormat(V4L2DeviceFormat *format);
ImageFormats formats();
int exportBuffers(BufferPool *pool);
int importBuffers(BufferPool *pool);
int releaseBuffers();
int queueBuffer(Buffer *buffer);
Signal<Buffer *> bufferReady;
int streamOn();
int streamOff();
static V4L2Device *fromEntityName(const MediaDevice *media,
const std::string &entity);
protected:
std::string logPrefix() const;
private:
int getFormatMeta(V4L2DeviceFormat *format);
int setFormatMeta(V4L2DeviceFormat *format);
int getFormatMultiplane(V4L2DeviceFormat *format);
int setFormatMultiplane(V4L2DeviceFormat *format);
int getFormatSingleplane(V4L2DeviceFormat *format);
int setFormatSingleplane(V4L2DeviceFormat *format);
int requestBuffers(unsigned int count);
int createPlane(Buffer *buffer, unsigned int plane,
unsigned int length);
std::vector<unsigned int> enumPixelformats();
std::vector<SizeRange> enumSizes(unsigned int pixelFormat);
Buffer *dequeueBuffer();
void bufferAvailable(EventNotifier *notifier);
std::string deviceNode_;
int fd_;
V4L2Capability caps_;
enum v4l2_buf_type bufferType_;
enum v4l2_memory memoryType_;
BufferPool *bufferPool_;
std::atomic<unsigned int> queuedBuffersCount_;
EventNotifier *fdEvent_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_V4L2_DEVICE_H__ */
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